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Pulley/Belt Squeak

13K views 20 replies 14 participants last post by  cdipierr2  
#1 ·
Sorry if this is the wrong section.

Only, and I mean only, when it is extremely humid outside, or when it rains a lot and the engine bay gets wet, there is a squeaking noise. It's not a squeal, so I don't think its the belt... It's like: squeak squeak squeak squeak and gets faster as you rev the engine. Not louder or anything... After you run the car for a while and it heats up and the water evaporates it stops.

Any idea what this is? I thought I had found a thread on a specific pulley causing this before but now I can't find it, and I'm also seeing multiple pulleys.

Thanks guys!
 
#7 ·
Yes! My car does this too occasionally. One day it was just obnoxious and I couldn't handle it so I called my dad outside and had him take a look at it. He grabbed some kind of lubricant, but I didn't see what he did with it. It took him like 3 seconds to get the squeaking to stop. Then it happened again like a month later, so he did the same thing. It is squeaking again now, but not as loud as it used to. So whatever my dad did to it wasn't a fix, and this squeak is annoying.
 
#18 ·
what your dad doing is for ONLY temporarily. He's spraying lubrication on the belt so it slips against pulleys. Don't do it. This step should be done only to identify which part is faulty. Mind as well turn up the radio instead.

Either your belt is aging and time to replace it or tensioner is loosing up.
I would start with belt. I would stick with OEM belt for accuracy. (belt shouldn't hurt your wallet much).
 
#8 ·
Image

This is the belt that my dad put lubricant on, so I know, at least for my car- this is the belt making the squeaking noise. I was told by my friend that the arms or something need to be adjusted to pull the belt tighter so it doesn't squeak. I honestly wouldn't trust him though. Some things he says are right, but then sometimes he has methods to fix things that def aren't safe.
 
#9 ·
This is the belt that my dad put lubricant on, so I know, at least for my car- this is the belt making the squeaking noise. I was told by my friend that the arms or something need to be adjusted to pull the belt tighter so it doesn't squeak. I honestly wouldn't trust him though. Some things he says are right, but then sometimes he has methods to fix things that def aren't safe.
In my limited experience, the belt that squeeks is usually the alternator belt, which is what you took a picture of. (so it appears) In the past i've seen and had the belt tightened up by moving the alternator "out." If i recall correctly you loosen the alternator bolt while holding tension on the alternator (so it doesnt go forward) and you pull it back a little bit. No idea how much. And then resecure the nut.

Granted i'm a computer geek trying to describe automotive... not my forte
 
#12 ·
you cant adjust the alternator. The tensioner loosens up when you pull on it then tightens when you let it go. Mine squeaks real loud when its colds. Maybe the pulleys?
 
#15 ·
fyi, there is only one belt. And the tensioner will adjust by itself.

You can try spraying a little bit of belt conditioner on the teeth of the belt while its spinning (be careful)..
 
#17 ·
First thing I'd do is take a look and see if there's any visible cracks forming on the belt. Look with a little flashlight around the points that it's being flexed and stressed on each of the pulleys. If it has any at all it can make noise.

As fasteddy already mentioned too, belts do stretch out over time as well, is it time to replace it? There's only so much that the tensioner will do to take up slack and still be providing enough tension to keep it tight enough on the pulleys.
 
#21 ·
I've started to get the same issue. When the car's cold and RPMs are above 3k it chirps. The belt is relatively new (30k-ish miles), so I wonder if it's the tensioner pulley itself? It looks shiny and maybe glazed. Belt has no obvious cracks. This is my 3rd tensioner, but usually they seem to cause low RPM squeals not this...